Air-pump for either vacuum or pressure.



G. l. LEONARD.

Am PUMP Foa mHER vAcuuM oa PRESSURE.

APPLICATION FlLED APR. 16| 1914. 1,18,286, Patented June 20, 1916.

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GEORGE I. LEONARD, OF LOS ANGELES, CALIFORNIA, ASSIGNOR T0 LEONARD ROTARY PUMP CORPORATION, OF LOS ANGELES, CALIFORNIA, A CORPORATION 0F CALI- FORNIA.

AIR-PUMP FOR EITHER VACIIUM OR PRESSURE.

Specification of Letters Patent.

Application yiled April 16, 1914. Serial No. 832,366.

To all whom t may concern:

Be it known that I, GEORGE I. LEoNARD, a citizen of the United States, residing at Los Angeles, county of Los Angeles, and State of California, have invented a new and useful Air-Pump for Either Vacuum or Pressure, of which the following is a specification.

This pump constitutes an improvement on a pum for which patent was granted me July 22u 1913, Number 1068251.

In carrying out my invention I employ a pair of gears meshing closely together and tting into a case which entirely surrounds the face of the gears with the exception of a small space on one sidel between the gears which constitutes theintake; the' exhaust parts of the pump are located in the side casing on the oppositeslde of the line of contact of the gears just above the lme Joimng their centers and the pump employs a liquid seal between the gears and case, the preerred form being with gears and case submerged in this liquid sealland the entire works placed within .a cylinder or casing which acts as a container and pressure chainber, though other mountings may be made without interfering with the principle involved iii the pump; further the orm of gear used is a spiral gear of the herringbone type or a straight toothed or spur gear may also be used. i.

Referring to the drawings Figure l is a cross section of the cylinder showing the pump with end plate and bearing removed. Fig. 2 is a cross section of cylinder showing a longitudinal section of pump case with gear in place.

No. 3 are the gears.

4 is the gear case.v Y

5 is a shaft carrying one of the gears.

6 is the intake.

No. 7 is the end plate.

8 is the flanged opening'to receive the pump.

9 ,are the exhaust openings in the end plates.A I

10 are the passages communicating with exhaust port and outer casing.

ll is an opening in top of outer case for air pipe connection to any external work.

12 oriices to admit sealing liquid.

In operation, as the gears rotate in the direction shown by the arrow, air is taken in at the ,intake port in the vacant spaces between the teeth and carried around to the contact line between the gearsxand is thus gradually compressed as the gear teeth commenceito mesh until the exhaust port is reached which lies very close to the line of centers of the two gears and located one on each side casing, where it is exhausted into the outer chamber surrounding the pump then it will be noticed that this completely closing over of the faces of the gears opposite the intake, takes olf nearly all of the pressure from the bearings with the exception of the pressure in tlose teeth in which compression is taking p ace.

Referring to my application Serial Num ber 7 64,259, the teeth are so arranged that in rotation the least point of contact is the vertex formed at the intersection of the teeth and the gear casing is left open at the top to permit the escape of air, while in the present case, the last point of contact is the outer portion of the tooth next the side casing at the point of discharge. Alittle sealing liquid may be admitted to the gears at any point from the intake to part way around thegear by small orifices bored through the gear case and communicating with the supply of sealing liquid in the outer case.

1 A rotary geared liquid sealed air pump, comprising a pair of rotatively mounted intermeshing gears working within a closely fitting case having an intake port on one side of the line of their centers, exhaust ports in the side casing on the opposite side of the line of their centers, the gear teeth being obliquely disposed with their last points of contact next the side casing, the faces of the gears entirely inclosedexcept at the point of intake.

2.'A rotary geared liquid sealed air pump comprising a pair of rotatively mounted intermeshing gears working within a closely fitting case, having an intake porton one side of the line of their centers, exhaust ports in the side casing on the opposite side of the line of their centers, the faces of the gears entirely inclosed except at the point of intake.

.Patented J une'20, 1916. /J

3. A rotary geared liquid sealed air pump, comprising a pair of rotatively mounted 1ntermeshing gears workin Within a closely fitting case having an int e port on one side of the line of their centers, exhaust ports in the s ide casing on the opposite side of the line of their centers, the gear teeth belng obliquely disposed Wlth their last points of contact next the side casing, the faces of the gears entirely inclosed except at the point of intake, orifices ,in the case near the intake port to admit sealin liquid.

4. A rotary geare liquid comprising a pair of rotatively mounted intermeshing gears vWorking within a closely fitting case, having an intake port on one side of the line of their-centers, exhaustports in the sidecasing onthe opposite side of the line of their centers, the faces of the gears entirely inclosed except atthe point of intake,

'tirely in sealed air pump Maase@ consisting of two or more intermeshing gears. rotatively mounted within a closely fitting casing, having intake-port or ports onone side of the line of their centers and exhaust ports in the side casing on the opposite side of the l'ne of their centers, the casing en` losing the faces of the gears except at their intake ports, orifices in the gear case between the intake and exhaust ports to admit sealing liquid and the entire pump submerged in a sealing liquid Within an outer casing substantially as described.

GEORGE I. LEONARD. Witnesses:

DEssA WILLIAMS, E. M. HARWQOD. 

